I have a 84 300sd and I am trying to get the power antenna to work. I purchased a tested working hirschman 6000 antenna installed it but it will not go up or down. I replaced the antenna switch on the dash with a new one. I tested the wires at the antenna plug and they show proper voltage. The car does not have a radio, the PO removed it. I believe he had an aftermarket radio in there. Is there any wiring that needs to be checked near where the radio was to make the antenna work?

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